3085. This is a Crandall hammer, it's a stone dressing tool made from several sharpened spikes which are held together with a frame and wedge. It was used to roughen the face of cut stone so that mortar would adhere to it.Larger image

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3069 is definitely a mine, but surprisingly hard to ID specifically. Especially since (per Anon@7:38) it plainly has a tripwire trigger and a light anti-personnel-style fuse, but is as large as an anti-tank mine.

3088: Just a guess: for cutting out consistent size servings from a soft product like butter or cheese?3099: I was wonder whether the ring is part of the arming mechanism rather than a tripwire trigger. It could be some sort of tilt-rod mine missing most of said tilt-rod.